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Rezultatul calculuilui 9⁹-9⁸x8-9⁷x8-9⁶x8-9⁵x8-9⁴x8-9³x8-9²x8-9¹x8 este...
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Răspuns :

9⁹-9⁸•8-9⁷•8-9⁶•8-9⁵•8-9⁴•8-9³•8-9²•8-9¹•8

=9⁹ -9⁸•(9-1) -9⁷•(9-1) -9⁶•(9-1) -9⁵•(9-1) -9⁴•(9-1) -9³•(9-1) -9²•(9-1)-9¹•(9-1)

=9⁹ -9⁹ +9⁸ -9⁸+9⁷-9⁷+9⁶-9⁶+9⁵-9⁵+9⁴-9⁴+9³-9³+9²-9²+9¹

=9